sPHENIX discussion of the superconducting solenoid

["Feder, Russell" <rfeder AT bnl.gov>]

Kin

Thanks, this is good research. I will incorporate into my ESRD slides

Russ

Russell Feder

Brookhaven National Lab

sPHENIX Chief Mechanical Engineer

https://www.linkedin.com/in/russell-feder-engineer-manager/

631-655-2491

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From: sPHENIX-magnet-l <sphenix-magnet-l-bounces AT lists.bnl.gov> on behalf of Yip, Kin <kinyip AT bnl.gov>
Sent: Monday, May 3, 2021 12:33 PM
To: Haggerty, John <haggerty AT bnl.gov>
Cc: sphenix-magnet-l AT lists.bnl.gov <sphenix-magnet-l AT lists.bnl.gov>; Glenn Young <glennyoung82251 AT gmail.com>
Subject: [Sphenix-magnet-l] OMC surveillance/SMF training => 2 T is the general workplace limit

 

Hi John,

 

After our discussion about working inside 5 G static magnetic field line.   The Collider User Training that you’ve had:

https://www.bnl.gov/training/docs/pdf/Collider-User-Training-Guide.pdf  said on p.45 that if you work inside 5 G, you

need to contact our OMC to make sure that you don’t have pacemaker, insulin pump etc.

 

This reminds me that I’ve always clicked  “Static Magnetic Field>=5 Gauss” in my JAF (Job Assessment Form) so that I’ve got OMC medical surveillance

as shown in the attached screenshot.

 

In fact, I’ve taken the static magnetic field training many times :

https://training.bnl.gov/portal/TQ-SMF  (in which you can take a glimpse of our Magnet with an ANSALDO sign)

 

and I’ve just taken it again. 

 

From the above training and also this documentation in SBMS (https://intranet.bnl.gov/esh/shsd/Requirements/IBR_Standards/NIR_ACGIH_TLV.pdf):

 

For the static magnetic field, the whole-body limits (we use at BNL) are:

 

TLV (Threshold Limit Values):   2 T (general workplace)

                                                       8 T (special training)

 

So, you can go to area up to 2 T if you have that OMC surveillance and the SMF training (this training seems to be required only >= 600 G … but it’s not too bad to take it).   

The SMF training said that at BNL currently, there is nothing > 2 T actually 😊

 

From this document,  https://sbms.bnl.gov/Uploads/SA/118/9.1/1u02e011.pdf, the next sign after 5 G is 2 T.

 

So, it seems that basically, you just need to make sure you’ve the OMC surveillance (and probably the SMF training) in order to work in an area of (say) 100 G 😊

I’ve done a couple/few MRI, those magnetic fields are 3 T or higher …

 

Kin

 

PS: I send this to our mailing list as the links provided above may be of use in the future.